CBufStore Class Reference

class CBufStore : public CStreamStore

In-memory non-persistent store. The buffer store does not have a root stream and cannot be closed without losing all the data.

It implements many of the operations defined by the store abstract framework. Specifically, streams in this store can be: overwritten, replaced, appended, deleted, and created in advance of being written to. However the class does not support commit and revert operations.

Overwriting an existing stream can result in a shorter stream; however, a stream cannot be extended beyond its original length. Replacing a stream can result in a stream which is longer or shorter than the original. The order in which streams are written to a memory store is not important as streams can be changed and rewritten.

Inherits from

Constructor & Destructor Documentation

CBufStore(TInt)

IMPORT_CCBufStore(TIntanExpandSize)

Parameters

TInt anExpandSize

~CBufStore()

IMPORT_C~CBufStore()

Member Functions Documentation

BufL(TStreamId)

CBufSeg &BufL(TStreamIdanId)const [private]

Parameters

TStreamId anId

DoCreateL(TStreamId &)

IMPORT_C MStreamBuf *DoCreateL(TStreamId &anId)[protected, virtual]

Creates a new stream in the store. The function gets the allocated stream id in the anId parameter. A stream buffer for the stream should be returned, ready to write into the new stream. This provides the implementation for the RStoreWriteStream::CreateL() functions.

The stream buffer to be written to.

Parameters

TStreamId & anIdOn return, contains the allocated stream id.

DoDeleteL(TStreamId)

IMPORT_C voidDoDeleteL(TStreamIdanId)[protected, virtual]

Parameters

TStreamId anId

DoExtendL()

IMPORT_C TStreamIdDoExtendL()[protected, virtual]

DoReadL(TStreamId)

IMPORT_C MStreamBuf *DoReadL(TStreamIdanId)const [protected, virtual]

Opens the requested stream for reading. The function should return a stream buffer positioned at the beginning of this stream.

This function is called by the OpenL() and OpenLC() member functions of RStoreReadStream.

A stream buffer positioned at the beginning of the stream to be read.

RStoreReadStream::OpenL()

RStoreReadStream::OpenLC()

Parameters

TStreamId anIdThe stream to be read.

DoReplaceL(TStreamId)

IMPORT_C MStreamBuf *DoReplaceL(TStreamIdanId)[protected, virtual]

Parameters

TStreamId anId

DoWriteL(TStreamId)

IMPORT_C MStreamBuf *DoWriteL(TStreamIdanId)[protected, virtual]

Parameters

TStreamId anId

NewL(TInt)

IMPORT_C CBufStore *NewL(TIntanExpandSize)[static]

Parameters

TInt anExpandSize

NewLC(TInt)

IMPORT_C CBufStore *NewLC(TIntanExpandSize)[static]

Parameters

TInt anExpandSize

Member Data Documentation

CArrayFixFlat< CBufSeg * > iBufArray

CArrayFixFlat< CBufSeg * >iBufArray[private]

TInt iExpandSize

TInt iExpandSize[private]